Question

Which of the following wavelengths of radiation has the highest bacterial efficiency?

(a) 270 nm

(b) 280 nm

(c) 265 nm

(d) 290 nm

I have been asked this question in quiz.

This is a very interesting question from Continuous Sterilization in section Sterilization of Fermentation Technology

Answer 1

The correct choice is (c) 265 nm

Explanation: The wavelengths around 265 nm has the highest bacterial efficiency. The radiation of 265 nm is absorbed by cellular components, leading to DNA damage and cell death. X-rays and Gamma rays are considered to be more lethal.